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 /* * Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file * for details. All rights reserved. Use of this source code is governed by a * BSD-style license that can be found in the LICENSE file. */ /** * @assertion A type T0 is a subtype of a type T1 (written T0 <: T1) when: * Named Function Types: T0 is U0 Function * (T0 x0, ..., Tn xn, {Tn+1 xn+1, ..., Tm xm}) * * and T1 is U1 Function(S0 y0, ..., Sn yn, * {Sn+1 yn+1, ..., Sq yq}) * and {yn+1, ... , yq} subset of {xn+1, ... , xm} * and Si[Z0/Y0, ..., Zk/Yk] <: Vi[Z0/X0, ..., Zk/Xk] for i in 0...n * and Si[Z0/Y0, ..., Zk/Yk] <: Tj[Z0/X0, ..., Zk/Xk] for i in n+1...q, yj = xi * and U0[Z0/X0, ..., Zk/Xk] <: U1[Z0/Y0, ..., Zk/Yk] * and B0i[Z0/X0, ..., Zk/Xk] === B1i[Z0/Y0, ..., Zk/Yk] for i in 0...k * where the Zi are fresh type variables with bounds B0i[Z0/X0, ..., Zk/Xk] * @description Check that if T0 and T1 satisfies the rules above, then T0 is * subtype of T1. Test generic types * @author sgrekhov@unipro.ru */ /** * @description Check that if type T0 is a subtype of a type T1, then instance * of T0 can be be used as a return value of type T1 * @author sgrekhov@unipro.ru */ /* * This test is generated from named_function_types_A02.dart and * return_value_x01.dart. * Don't modify it. If you want to change this file, change one of the files * above and then run generator.dart to regenerate the tests. */ class A {} class C extends A {} class U0 extends U1 {} class U1 {} class B0 {} class B1 {} class V0 {} class V1 {} class V2 {} class V3 {} class V4 {} class S0 extends V0 {} class S1 extends V1 {} class S2 extends V2 {} class S3 extends V3 {} class X0 extends B0 {} class X1 extends B1 {} class Y0 extends B0 {} class Y1 extends B1 {} typedef T0 = U0, int> Function( V0 x0, V1 x1, {V2 x2, V3 x3, V4 x4}); typedef T1 = U1 Function( S0, int> y0, S1, int> y1, {S2, int> x2, S3, int> x3}); U0, int> t0Func( V0 x0, V1 x1, {V2 x2, V3 x3, V4 x4}) => null; U1 t1Func( S0, int> y0, S1, int> y1, {S2, int> x2, S3, int> x3}) => null; T0 t0Instance = t0Func; T1 t1Instance = t1Func; T1 returnValueFunc() => t0Instance; class ReturnValueTest { static T1 staticTestMethod() => t0Instance; T1 testMethod() => t0Instance; T1 get testGetter => t0Instance; } main() { T1 returnValueLocalFunc() => t0Instance; returnValueFunc(); returnValueLocalFunc(); ReturnValueTest.staticTestMethod(); new ReturnValueTest().testMethod(); new ReturnValueTest().testGetter; }